/Engine/Source/Runtime/GeometryCore/Public/Spatial/OccupancyGrid3.h
Given an index into the occupancy grid, returns the midpoint of the bbox that represents the matching cell in the winding number grid, from which the occupancy got computed.
FVector3f GetCellCenterFromIndex ( const [FVector3i](API\Runtime\GeometryCore\FVector3i) & Index ) const